Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 371 insertions, 0 deletions

diff --git a/kernel/spinlock.c b/kernel/spinlock.c
new file mode 100644
index 000000000000..e15ed17863f1
--- /dev/null
+++ b/kernel/spinlock.c
@@ -0,0 +1,371 @@
+/*
+ * Copyright (2004) Linus Torvalds
+ *
+ * Author: Zwane Mwaikambo <zwane@fsmlabs.com>
+ *
+ * Copyright (2004) Ingo Molnar
+ */
+
+#include <linux/config.h>
+#include <linux/linkage.h>
+#include <linux/preempt.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+
+/*
+ * Generic declaration of the raw read_trylock() function,
+ * architectures are supposed to optimize this:
+ */
+int __lockfunc generic_raw_read_trylock(rwlock_t *lock)
+{
+        _raw_read_lock(lock);
+        return 1;
+}
+EXPORT_SYMBOL(generic_raw_read_trylock);
+
+int __lockfunc _spin_trylock(spinlock_t *lock)
+{
+        preempt_disable();
+        if (_raw_spin_trylock(lock))
+                return 1;
+        
+        preempt_enable();
+        return 0;
+}
+EXPORT_SYMBOL(_spin_trylock);
+
+int __lockfunc _read_trylock(rwlock_t *lock)
+{
+        preempt_disable();
+        if (_raw_read_trylock(lock))
+                return 1;
+
+        preempt_enable();
+        return 0;
+}
+EXPORT_SYMBOL(_read_trylock);
+
+int __lockfunc _write_trylock(rwlock_t *lock)
+{
+        preempt_disable();
+        if (_raw_write_trylock(lock))
+                return 1;
+
+        preempt_enable();
+        return 0;
+}
+EXPORT_SYMBOL(_write_trylock);
+
+#ifndef CONFIG_PREEMPT
+
+void __lockfunc _read_lock(rwlock_t *lock)
+{
+        preempt_disable();
+        _raw_read_lock(lock);
+}
+EXPORT_SYMBOL(_read_lock);
+
+unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock)
+{
+        unsigned long flags;
+
+        local_irq_save(flags);
+        preempt_disable();
+        _raw_spin_lock_flags(lock, flags);
+        return flags;
+}
+EXPORT_SYMBOL(_spin_lock_irqsave);
+
+void __lockfunc _spin_lock_irq(spinlock_t *lock)
+{
+        local_irq_disable();
+        preempt_disable();
+        _raw_spin_lock(lock);
+}
+EXPORT_SYMBOL(_spin_lock_irq);
+
+void __lockfunc _spin_lock_bh(spinlock_t *lock)
+{
+        local_bh_disable();
+        preempt_disable();
+        _raw_spin_lock(lock);
+}
+EXPORT_SYMBOL(_spin_lock_bh);
+
+unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock)
+{
+        unsigned long flags;
+
+        local_irq_save(flags);
+        preempt_disable();
+        _raw_read_lock(lock);
+        return flags;
+}
+EXPORT_SYMBOL(_read_lock_irqsave);
+
+void __lockfunc _read_lock_irq(rwlock_t *lock)
+{
+        local_irq_disable();
+        preempt_disable();
+        _raw_read_lock(lock);
+}
+EXPORT_SYMBOL(_read_lock_irq);
+
+void __lockfunc _read_lock_bh(rwlock_t *lock)
+{
+        local_bh_disable();
+        preempt_disable();
+        _raw_read_lock(lock);
+}
+EXPORT_SYMBOL(_read_lock_bh);
+
+unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock)
+{
+        unsigned long flags;
+
+        local_irq_save(flags);
+        preempt_disable();
+        _raw_write_lock(lock);
+        return flags;
+}
+EXPORT_SYMBOL(_write_lock_irqsave);
+
+void __lockfunc _write_lock_irq(rwlock_t *lock)
+{
+        local_irq_disable();
+        preempt_disable();
+        _raw_write_lock(lock);
+}
+EXPORT_SYMBOL(_write_lock_irq);
+
+void __lockfunc _write_lock_bh(rwlock_t *lock)
+{
+        local_bh_disable();
+        preempt_disable();
+        _raw_write_lock(lock);
+}
+EXPORT_SYMBOL(_write_lock_bh);
+
+void __lockfunc _spin_lock(spinlock_t *lock)
+{
+        preempt_disable();
+        _raw_spin_lock(lock);
+}
+
+EXPORT_SYMBOL(_spin_lock);
+
+void __lockfunc _write_lock(rwlock_t *lock)
+{
+        preempt_disable();
+        _raw_write_lock(lock);
+}
+
+EXPORT_SYMBOL(_write_lock);
+
+#else /* CONFIG_PREEMPT: */
+
+/*
+ * This could be a long-held lock. We both prepare to spin for a long
+ * time (making _this_ CPU preemptable if possible), and we also signal
+ * towards that other CPU that it should break the lock ASAP.
+ *
+ * (We do this in a function because inlining it would be excessive.)
+ */
+
+#define BUILD_LOCK_OPS(op, locktype)                                    \
+void __lockfunc _##op##_lock(locktype##_t *lock)                        \
+{                                                                       \
+        preempt_disable();                                              \
+        for (;;) {                                                      \
+                if (likely(_raw_##op##_trylock(lock)))                  \
+                        break;                                          \
+                preempt_enable();                                       \
+                if (!(lock)->break_lock)                                \
+                        (lock)->break_lock = 1;                         \
+                while (!op##_can_lock(lock) && (lock)->break_lock)      \
+                        cpu_relax();                                    \
+                preempt_disable();                                      \
+        }                                                               \
+        (lock)->break_lock = 0;                                         \
+}                                                                       \
+                                                                        \
+EXPORT_SYMBOL(_##op##_lock);                                            \
+                                                                        \
+unsigned long __lockfunc _##op##_lock_irqsave(locktype##_t *lock)       \
+{                                                                       \
+        unsigned long flags;                                            \
+                                                                        \
+        preempt_disable();                                              \
+        for (;;) {                                                      \
+                local_irq_save(flags);                                  \
+                if (likely(_raw_##op##_trylock(lock)))                  \
+                        break;                                          \
+                local_irq_restore(flags);                               \
+                                                                        \
+                preempt_enable();                                       \
+                if (!(lock)->break_lock)                                \
+                        (lock)->break_lock = 1;                         \
+                while (!op##_can_lock(lock) && (lock)->break_lock)      \
+                        cpu_relax();                                    \
+                preempt_disable();                                      \
+        }                                                               \
+        (lock)->break_lock = 0;                                         \
+        return flags;                                                   \
+}                                                                       \
+                                                                        \
+EXPORT_SYMBOL(_##op##_lock_irqsave);                                    \
+                                                                        \
+void __lockfunc _##op##_lock_irq(locktype##_t *lock)                    \
+{                                                                       \
+        _##op##_lock_irqsave(lock);                                     \
+}                                                                       \
+                                                                        \
+EXPORT_SYMBOL(_##op##_lock_irq);                                        \
+                                                                        \
+void __lockfunc _##op##_lock_bh(locktype##_t *lock)                     \
+{                                                                       \
+        unsigned long flags;                                            \
+                                                                        \
+        /*                                                      */      \
+        /* Careful: we must exclude softirqs too, hence the     */      \
+        /* irq-disabling. We use the generic preemption-aware   */      \
+        /* function:                                            */      \
+        /**/                                                            \
+        flags = _##op##_lock_irqsave(lock);                             \
+        local_bh_disable();                                             \
+        local_irq_restore(flags);                                       \
+}                                                                       \
+                                                                        \
+EXPORT_SYMBOL(_##op##_lock_bh)
+
+/*
+ * Build preemption-friendly versions of the following
+ * lock-spinning functions:
+ *
+ *         _[spin|read|write]_lock()
+ *         _[spin|read|write]_lock_irq()
+ *         _[spin|read|write]_lock_irqsave()
+ *         _[spin|read|write]_lock_bh()
+ */
+BUILD_LOCK_OPS(spin, spinlock);
+BUILD_LOCK_OPS(read, rwlock);
+BUILD_LOCK_OPS(write, rwlock);
+
+#endif /* CONFIG_PREEMPT */
+
+void __lockfunc _spin_unlock(spinlock_t *lock)
+{
+        _raw_spin_unlock(lock);
+        preempt_enable();
+}
+EXPORT_SYMBOL(_spin_unlock);
+
+void __lockfunc _write_unlock(rwlock_t *lock)
+{
+        _raw_write_unlock(lock);
+        preempt_enable();
+}
+EXPORT_SYMBOL(_write_unlock);
+
+void __lockfunc _read_unlock(rwlock_t *lock)
+{
+        _raw_read_unlock(lock);
+        preempt_enable();
+}
+EXPORT_SYMBOL(_read_unlock);
+
+void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
+{
+        _raw_spin_unlock(lock);
+        local_irq_restore(flags);
+        preempt_enable();
+}
+EXPORT_SYMBOL(_spin_unlock_irqrestore);
+
+void __lockfunc _spin_unlock_irq(spinlock_t *lock)
+{
+        _raw_spin_unlock(lock);
+        local_irq_enable();
+        preempt_enable();
+}
+EXPORT_SYMBOL(_spin_unlock_irq);
+
+void __lockfunc _spin_unlock_bh(spinlock_t *lock)
+{
+        _raw_spin_unlock(lock);
+        preempt_enable();
+        local_bh_enable();
+}
+EXPORT_SYMBOL(_spin_unlock_bh);
+
+void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
+{
+        _raw_read_unlock(lock);
+        local_irq_restore(flags);
+        preempt_enable();
+}
+EXPORT_SYMBOL(_read_unlock_irqrestore);
+
+void __lockfunc _read_unlock_irq(rwlock_t *lock)
+{
+        _raw_read_unlock(lock);
+        local_irq_enable();
+        preempt_enable();
+}
+EXPORT_SYMBOL(_read_unlock_irq);
+
+void __lockfunc _read_unlock_bh(rwlock_t *lock)
+{
+        _raw_read_unlock(lock);
+        preempt_enable();
+        local_bh_enable();
+}
+EXPORT_SYMBOL(_read_unlock_bh);
+
+void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
+{
+        _raw_write_unlock(lock);
+        local_irq_restore(flags);
+        preempt_enable();
+}
+EXPORT_SYMBOL(_write_unlock_irqrestore);
+
+void __lockfunc _write_unlock_irq(rwlock_t *lock)
+{
+        _raw_write_unlock(lock);
+        local_irq_enable();
+        preempt_enable();
+}
+EXPORT_SYMBOL(_write_unlock_irq);
+
+void __lockfunc _write_unlock_bh(rwlock_t *lock)
+{
+        _raw_write_unlock(lock);
+        preempt_enable();
+        local_bh_enable();
+}
+EXPORT_SYMBOL(_write_unlock_bh);
+
+int __lockfunc _spin_trylock_bh(spinlock_t *lock)
+{
+        local_bh_disable();
+        preempt_disable();
+        if (_raw_spin_trylock(lock))
+                return 1;
+
+        preempt_enable();
+        local_bh_enable();
+        return 0;
+}
+EXPORT_SYMBOL(_spin_trylock_bh);
+
+int in_lock_functions(unsigned long addr)
+{
+        /* Linker adds these: start and end of __lockfunc functions */
+        extern char __lock_text_start[], __lock_text_end[];
+
+        return addr >= (unsigned long)__lock_text_start
+        && addr < (unsigned long)__lock_text_end;
+}
+EXPORT_SYMBOL(in_lock_functions);